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According to everyone on the Durmax forums, including dealers, Duramax's make peak torque at 2100 rpm. Many on the forum have complained about poor mileage pulling in 6th gear and were advised to use 5th and mileage increased, temps lowered.
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2006 Mobile Suites 32TK3 SOLD 2003 Teton Grand Freedom, 2006 Freightliner Centry 515 hp Detroit 60 Traveling USA welding pipe
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